Spatial Distribution Patterns of (Hemiptera, Coccidae) and of the Ampelovirus GLRaV-1 and the Vitivirus GVA in a Commercial Vineyard.

Distribution patterns of the European fruit lecanium (Bouché) and of grapevine leafroll-associated virus-1 (GLRaV-1) and grapevine virus A (GVA) were monitored from 2003 to 2015 in a Riesling vine plot in the northeast of France. Virus spread was compared between two periods: 2003-2008 and 2009-2014. The percentage of infected vines increased from 54 to 78% for GLRaV-1 and from 14 to 26% for GVA.